Which spacecraft has visited Uranus and Neptune?

• A. Cassini
• B. Voyager
• C. New Horizons
• D. Pioneer

Answer: (B)

Visiting both Uranus and Neptune in one mission is possible only with a trajectory that reaches both outer planets in sequence. Voyager 2 did exactly that as part of NASA’s Grand Tour, flying by Jupiter, Saturn, Uranus, and then Neptune. It provided the only close observations of Uranus in 1986 and Neptune in 1989, along with detailed data and imagery from both worlds. The other missions focused on different targets: Cassini studied Saturn from orbit, New Horizons went to Pluto and then the Kuiper Belt, and Pioneer probes did earlier outer-planet flybys but did not visit Uranus or Neptune. So Voyager 2 is the only spacecraft to have visited both Uranus and Neptune.